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doc: more go1.8.html updates
TBR=See https://golang.org/cl/33244 Updates #17929 Change-Id: I648df63aeb67aa2229c7b4fc23676a78b31140a0 Reviewed-on: https://go-review.googlesource.com/33657 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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Brad Fitzpatrick
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@ -49,7 +49,8 @@ and <a href="#sort">simplifies sorting slices</a>.
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<p> <!-- CL 17711 -->
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The language specification now only requires that implementations
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support up to 16-bit exponents in floating-point constants. This does not affect
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either the <code>gc</code> or <code>gccgo</code> compilers, both of
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either the “<a href="/cmd/compile/"><code>gc</code></a>” or
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<code>gccgo</code> compilers, both of
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which still support 32-bit exponents.
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</p>
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@ -214,8 +215,10 @@ generates more compact, more efficient code
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and provides a better platform for optimizations
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such as bounds check elimination.
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The new back end reduces the CPU time required by
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<a href="https://golang.org/test/bench/go1/">our benchmark programs</a> by N-M%.
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TODO: ARM binary size & perf numbers.
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<a href="https://golang.org/test/bench/go1/">our benchmark programs</a> by 20-30%
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on 32-bit ARM systems. For 64-bit x86 systems, which already used the SSA backend in
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Go 1.7, the gains are a more modest 0-10%. Other architectures will likely
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see improvements closer to the 32-bit ARM numbers.
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</p>
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<p>
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@ -234,15 +237,10 @@ TODO: ARM binary size & perf numbers.
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The compiler and linker have been optimized and run faster in this
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release than in Go 1.7, although they are still slower than we would
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like and will continue to be optimized in future releases.
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Compared to the previous release, Go 1.8 is
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<a href="https://dave.cheney.net/2016/11/19/go-1-8-toolchain-improvements">about 15% faster</a>.
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</p>
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<p>
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Due to changes across the compiler toolchain and standard library,
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binaries built with this release should typically be smaller than
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binaries built with Go 1.7, sometimes by as much as TODO numbers.
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</p>
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<h3 id="cmd_cgo">Cgo</h3>
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<p>TODO</p>
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@ -308,6 +306,12 @@ is unchanged, but there are a number of changes worth noting.
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function added in Go 1.7.
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</p>
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<p>
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<i>Updating:</i> Users of finalizers should see the example
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in the <a href="/pkg/runtime/#KeepAlive"><code>KeepAlive</code> documentation</a>
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to see where a call to <code>KeepAlive</code> might be needed.
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</p>
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<h3 id="memstats">MemStats Documentation</h3>
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<p> <!-- CL 28972 -->
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@ -358,7 +362,7 @@ packages.
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<h3 id="cgoperf">Cgo</h3>
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<p>Calls from Go into C are now TODO% faster.</p>
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<p>The overhead of calls from Go into C has been reduced by about half.</p>
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<h2 id="library">Standard library</h2>
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@ -644,7 +648,8 @@ pkg debug/pe, type StringTable []uint8</pre>
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<dl id="encoding_pem"><dt><a href="/pkg/encoding/pem/">encoding/pem</a></dt>
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<dd>
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<p> <!-- CL 27391 -->
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The PEM decoder is now strict about the format of the ending line.
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<a href="/pkg/encoding/pem/#Decode"><code>Decode</code></a>
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is now strict about the format of the ending line.
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</p>
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</dd>
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</dl>
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@ -673,10 +678,13 @@ pkg debug/pe, type StringTable []uint8</pre>
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<dl id="image_png"><dt><a href="/pkg/image/png/">image/png</a></dt>
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<dd>
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<p> <!-- CL 32143, CL 32140 -->
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The PNG decoder now supports truecolor and grayscale transparency.
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<a href="/pkg/image/png/#Decode"><code>Decode</code></a>
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(and <code>DecodeConfig</code>)
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now supports True Color and grayscale transparency.
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</p>
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<p> <!-- CL 29872 -->
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The PNG encoder is now faster and creates smaller output
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<a href="/pkg/image/png/#Encoder"><code>Encoder</code></a>
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is now faster and creates smaller output
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when encoding paletted images.
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</p>
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</dd>
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@ -702,19 +710,38 @@ pkg debug/pe, type StringTable []uint8</pre>
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<dd>
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<p>
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The package's parsing has been relaxed in two ways to accept
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The
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<a href="/pkg/mime/quotedprintable/#Reader"><code>Reader</code></a>'s
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parsing has been relaxed in two ways to accept
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more input seen in the wild. First, it now accepts
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a <code>=</code> sign even if it's not followed by two hex
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digits. <!-- CL 32174 -->
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Second, it accepts a trailing soft line-break at the end of a
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message. <!-- CL 27530 -->. That is, the final byte of the
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message. <!-- CL 27530 --> That is, the final byte of the
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message may be a <code>=</code> sign and it will now be ignored.
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</p>
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</dd>
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</dl>
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<dl id="net"><dt><a href="/pkg/net/">net</a></dt>
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<dd>
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<p><!-- CL 30164, CL 33473 -->
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The <a href="/pkg/net/#Conn"><code>Conn</code></a> documentation
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has been updated to clarify expectations of an interface
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implementation. Updates in the <code>net/http</code> packages
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depend on implementations obeying the documentation.
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</p>
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<p><i>Updating:</i> implementations of the <code>Conn</code> interface should verify
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they implement the documented semantics. TODO: https://golang.org/cl/18097
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</p>
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<p>TODO: many other net changes</p>
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</dd>
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</dl>
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<dl id="net_http"><dt><a href="/pkg/net/http/">net/http</a></dt>
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<dd>
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@ -758,7 +785,9 @@ pkg debug/pe, type StringTable []uint8</pre>
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middle of a slow request, the <code>Handler</code> can now
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detect that the user is gone. This complements the
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existing <a href="/pkg/net/http/#CloseNotifier"><code>CloseNotifier</code></a>
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support.
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support. This functionality requires that the underlying
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<a href="/pkg/net/#Conn"><code>net.Conn</code></a> implements
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<a href="#net">recently-clarified interface documentation</a>.
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</li>
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<li><!-- CL 32479 -->
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@ -794,7 +823,7 @@ pkg debug/pe, type StringTable []uint8</pre>
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now copies most request headers on redirect. Authentication-specific
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headers are only sent to the same origin or subdomains thereof.
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Cookies are not sent again, unless they were set explicitly.
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TODO: verify this, and link to docs once https://github.com/golang/go/issues/18096
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TODO: verify this, and link to docs once https://golang.org/issue/18096
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is fixed.
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</li>
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@ -973,8 +1002,10 @@ pkg debug/pe, type StringTable []uint8</pre>
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</p>
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<p> <!-- CL 33429 -->
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<code>Parse</code> now validates days that are too small, in
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addition to days that are too large.
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<a href="/pkg/time/#Parse"><code>Parse</code></a>
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now rejects dates before the start of a month, such as June 0;
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it already rejected dates beyond the end of the month, such as
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June 31 and July 32.
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</p>
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<p> <!-- CL 33029 -->
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